WebOptical brightening agents (OBA's), sometimes referred to as fluorescent whitening agents, are chemical compounds responsible for the "whitening" effect in materials. By absorbing ultraviolet light, and reemitting blue light, OBA's function to have a brightening effect on the substrate and/or "masking" the yellowish color.

optical-brighteners - Pylam Dyes

WebA fluorescent white material is one that has been treated with special chemicals known as optical brightening agents (OBA’s), or sometimes referred to as fluorescent whitening agents (FWA’s). Because OBA’s can be applied to colored materials as well, it is the more generic term of the two. WebFeb 6, 2024 · Optical brighteners which are normally used in laundry detergent can help in converting the low-density colors of the cloth such as yellow and brown color into high-density color i.e blue and ... fish cytokines

Optical Brightening Agents in Photographic Paper - JSTOR

WebDec 1, 2024 · ANDREW JACKSON. In concluding a 2009 survey of optical brightening agents (OBAs) 1, I wrote that, despite the difficulties faced by both producers and customers during an economic downturn, there was every reason to believe that OBAs would have a bright future.In some ways, little has changed in the intervening years, despite the highly … WebFluorescent optical brightener had a limited light resistance, much lower than pigments and most plastics. While in many cases, the photochemical degradation of fluorescent whitening agents shall not yellowing the plastics. 4.Hue. In most cases, people would prefer mid to blue to bluish green shade rather than red. WebPhotosensitisation can also generate hydroxyl radicals (OH C) by a Fenton reaction in which a metal ion is oxidized by hydrogen peroxide: Fe 2+ + H 2 O 2 Y Fe 3+ + OH C + OHG . … fish cystoscopy